Derek Jeter and girlfriend Minka Kelly have split up after three years, but even close friends of the pair say it came out of left field.

While many had expected the Yankees captain, 37, to settle down with 31-year-old actress and reigning Esquire “Sexiest Woman Alive” Kelly, the pair quietly parted ways a few weeks ago, sources confirmed to Page Six.

A source close to the private couple said the split has been coming for six weeks — even after Kelly was photographed cheering on Jeter from his family box after his milestone 3,000th hit on July 9.

The source said, “They didn’t want anyone to know they were breaking up until they had talked it all through. Their friends are shocked. But it seems to have happened in an amicable way. They aren’t saying bad things about each other. There was no huge drama. He’s under a lot of pressure with the Yankees, is married to the team, and she is working hard on a big TV show.”

Kelly is filming the TV revival of “Charlie’s Angels” in Miami and didn’t give anything away while promoting her show at the Teen Choice Awards on Aug. 7.

But another source told us, “They separated a couple of weeks ago. This has been hard. Like any relationship, breaking up is not easy. They were often apart because of work. They never lived together and were never formally engaged. She’s shooting in Miami and lives in LA, but she’s barely ever there.” Other sources said Jeter was uncomfortable with the revealing photo shoots that came with Kelly’s “sexiest woman” title.

Kelly has been keeping a low profile in Miami and sticking tight to her “Charlie’s Angels” co-stars. Her rep confirmed the split.

Last night, reports said Kelly was developing a “growing late-night friendship” with her co-star Ramon Rodriguez. “We have seen Minka and Ramon talking in his trailer way after hours, and often late into the night,” a source told People. Her rep didn’t get back to us.